A239023 Number of n X n 0..2 arrays with no element equal to the sum of elements to its left or one plus the sum of the elements above it, modulo 3

1, 3, 7, 59, 354, 7265, 107611, 5388959, 194626082, 23726658020, 2082243229557, 617263247981529, 131451761499759800, 94681989011284774859, 48894324154695455938601

Offset

1,2

Comments

Diagonal of A239030

Links

Table of n, a(n) for n=1..15.

Example

Some solutions for n=5
..2..0..0..0..0....2..0..0..0..0....2..0..0..0..0....2..0..0..0..0
..2..0..0..0..0....1..0..0..2..2....2..0..0..0..0....1..2..2..0..0
..1..2..2..0..0....2..0..0..1..2....1..0..0..0..2....2..1..2..0..0
..2..1..1..0..0....2..0..0..0..0....1..0..0..2..2....2..0..0..0..0
..1..0..0..0..0....1..0..0..2..1....2..0..0..1..1....1..2..1..0..2

Crossrefs

Sequence in context: A131652 A213734 A185846 * A341718 A164895 A046859

Adjacent sequences: A239020 A239021 A239022 * A239024 A239025 A239026

Keyword

nonn

Author

R. H. Hardin, Mar 09 2014

Status

approved